package com.sise.cn.utils;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/*对图片进行处理的类和方法*/

public class VerifyCode {  

	public static String drawRandomText(int width,int height,BufferedImage verifyImg) {
		Graphics2D graphics = (Graphics2D)verifyImg.getGraphics();
		graphics.setColor(Color.WHITE);//设置画笔颜色-验证码背景色
		graphics.fillRect(0, 0, width, height);//填充背景
		graphics.setFont(new Font("微软雅黑", Font.BOLD, 40));
		//数字和字母的组合
		String baseNumLetter = "123456789abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";	
		StringBuffer sBuffer = new StringBuffer();
		int x = 10;  //旋转原点的 x 坐标
		String ch = "";
		Random random = new Random();
		for(int i = 0;i < 4;i++){
			graphics.setColor(getRandomColor());
			//设置字体旋转角度
			int degree = random.nextInt() % 30;  //角度小于30度
			int dot = random.nextInt(baseNumLetter.length());
			ch = baseNumLetter.charAt(dot) + "";
			sBuffer.append(ch);
			//正向旋转
			graphics.rotate(degree * Math.PI / 180, x, 45);
			graphics.drawString(ch, x, 45);	
			//反向旋转
			graphics.rotate(-degree * Math.PI / 180, x, 45);
			x += 48;
		}
		//画干扰线
		for (int i = 0; i <6; i++) {
			// 设置随机颜色
			graphics.setColor(getRandomColor());
			// 随机画线	
			graphics.drawLine(random.nextInt(width), random.nextInt(height),random.nextInt(width), random.nextInt(height));
		}
		//添加噪点
		for(int i=0;i<30;i++){
			int x1 = random.nextInt(width);
			int y1 = random.nextInt(height);
			graphics.setColor(getRandomColor());
			graphics.fillRect(x1, y1, 2,2);
		}
		return sBuffer.toString();
	}

	/**
	* 随机取色
	*/
	
	private static Color getRandomColor() {
		Random ran = new Random();
		Color color = new Color(ran.nextInt(256),
		ran.nextInt(256), ran.nextInt(256));	
		return color;
	}
}